Functional stimuli responsive hydrogel devices by self-folding
Functional stimuli responsive hydrogel devices by self-folding
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DOI：
10.1088/0964-1726/23/9/094008
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发表时间：
2014-09-01
影响因子：
4.1
通讯作者：
Gracias, David H.
中科院分区：
文献类型：
--
作者：
Yoon, ChangKyu;Xiao, Rui;Gracias, David H.
我们描述了一种光刻方法，使用薄的梯度交联铰链和厚的完全交联面板来创建功能性刺激响应、自折叠、微型水凝胶装置。该水凝胶由聚（N-异丙基丙烯酰胺-丙烯酸）（pNIPAM-AAc）组成，具有略低于生理温度的可逆刺激响应特性。我们表明，温度或 pH 值可以形成并可逆地驱动各种三维结构。我们通过实验表征了 pNIPAM-AAc 的膨胀和机械性能，并开发了一个有限元模型来合理化自折叠及其随铰链厚度和膨胀比的变化。最后，我们重点介绍了这种方法在创建功能器件中的应用，例如自折叠聚合物微胶囊、不受束缚的微夹具和热控微镜系统。
We describe a photolithographic approach to create functional stimuli responsive, self-folding, microscale hydrogel devices using thin, gradient cross-linked hinges and thick, fully cross-linked panels. The hydrogels are composed of poly (N-isopropylacrylamide-co-acrylic acid) (pNIPAM-AAc) with reversible stimuli responsive properties just below physiological temperatures. We show that a variety of three-dimensional structures can be formed and reversibly actuated by temperature or pH. We experimentally characterized the swelling and mechanical properties of pNIPAM-AAc and developed a finite element model to rationalize self-folding and its variation with hinge thickness and swelling ratio. Finally, we highlight applications of this approach in the creation of functional devices such as self-folding polymeric micro-capsules, untethered micro-grippers and thermally steered micro-mirror systems.